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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9f9e53e633f09bf6fc700c711033815cb7e6b4ef4be7884ca49f75b0225380' 
  AND token = '3N2r4PLzPIqKZ9rSFflBeEyHoTvZadU03QJAx93q7Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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