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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cf8653d0acbe7b0ae9b43ff46cd70a6beace4a1dfc1c02587a09063a150e89' 
  AND token = 'IxRPkQKNg8Rz4F2pI8WutVANycRXNA07CaQtlvAUYcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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