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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aba7f26359eea5260cae63f566bba0e861279946fdf1b721b3d798a6be3dbb8' 
  AND token = 'feCSIM2TMfzYAc2cOguYR3IjDr4QMhU79CmCSg3E4iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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