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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0257a546c42a4d37197f9f9731d7414facf7b60b26cd0cbbb0bf7cf1b60069' 
  AND token = 'QGb1AFC4mQ6SJCeiMYjNV7m/hzJoeStz3lTA6D64098=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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