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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f6016c8395e955b003edbeccd288573b97383555da6513d532bb36c6bcfd04' 
  AND token = 'b07SfL4ghT1fHVulen3ObBMYohc+G4QRC3OfuzK1txM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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