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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1a30c84d3d565ac8a0a25d5680ca747c16fd5370e68a83da026b013fd76b5a' 
  AND token = 'PkiH7wISqH1ndxfENqeT22rcN01H6Gavvo2h4jJoOBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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