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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b1c51fda3839a6d332a98fd133c31946b49b86bac3fce62ebdf77a8b953d66' 
  AND token = 'S+KGzvwYVy7VjEe9kFnGyS9yDreKiys87HCOpgD7ekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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