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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ca14d184b68db531f066ac4cb13a1bc48e45ae4fe9a55be3b54f06e9bf5477' 
  AND token = '1OQkMOKoim3ipS9tRNLznYkx21kSrZ2muX6+zDlDOhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}