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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba0d90e792ba454121310e462766062be8d4e23b90eca4affb6b834788a0e89' 
  AND token = 'kaXvlmmaCQmS6C9nchIALD3V8UHQixJr7UsuI4aXpGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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