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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b29b08274e68cdf965ae1bb4a5546bf6017bcd21a31addbd4c9f94ff15dc8a' 
  AND token = 'ArupDxlzn9Q6OkfolHwM8knqH7X+vCWfiom5g3pA0M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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