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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44889e9db6684640bf6a80d0e536bbd003b1b9e2b71943e916c13313e0f5a0b' 
  AND token = '3DyeKp0dQNia+0EpojljTU3uJ1ckU1Zf6eTg8F2DCu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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