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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d94aab0923a454cec072471e45c4ecd064f34441b138c23969aebf852641da2' 
  AND token = '94Ox1+sK/d5Yfe2jYqshZe5RMY0/CFSpEYLrYluSLNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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