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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705d905b32801d3268f7ed543641b71e810b7ac6e892921ba19b512eb166f8ec' 
  AND token = 'u6JFuzCcncyc/ypXMzNaagnwdan1aveejtvQqnuwTd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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