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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee0de3361adac14eb6e844c454f15af243671499b2d0a02005f36af88bcfd54' 
  AND token = 'MH9ws65n+pPyIxws1RiajCZTEkspmgi2LKQ92lU19oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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