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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbda26593ddbef6fa6e9e05b71c8764e283ef3068cb2946d648993c2aa1ce47a' 
  AND token = '4KYSJKKvBJ6koXKawYP/v1XADiMtop4c/vB6Iu0LbuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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