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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caf932a46e1b4d697a9414a455807b94e9d1f5e3f3803bb883c90cdcc7d2496' 
  AND token = 'bbmh6/8uqGYImMisN0zDCBeF0kGZuO8QUdI7HexlKSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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