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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4be39e43d4558aed0e1f83969845fb3211e864112abc98850ac409bb482c56' 
  AND token = 'VhwqPCkH/j7FopLP46MHj4nq9gEftZr3epfOAII+byA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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