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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f66febef9eba7e8fcb8d6882d98c8db546dbf1447b0c878340368d4da6a181a' 
  AND token = 'b18vpTdWtVYsLBqgPwFrqhIQj5d9O11dSqTHkz667Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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