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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf601f4ac87bb5148f75f2931127755a672cbdb755bdd96e91ec71655fc3b2f' 
  AND token = 'walqge3GWii1/CufQm1W/4ad06iUN5+pQiGtf29r7qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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