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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9102bb741ecc8ccf4846b7431479b9ff4712ac09d13c2581c6ce07cc0d14e6' 
  AND token = 'qajop+S9lYtjBApOPMLNtcWZxCoYZN89rf+7eIz4Wl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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