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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb884f43c8d112411b3b8091763c5c9db964013b3464ccde0af4ac083da5820e' 
  AND token = '5hTAvtYVtE1+NzQlpwO3Gc0yE9oo2asDXJN3CrcwSHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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