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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e430e062ef8a67286ae801431f7326ca3d3c44c85c05db04fc0847d7c9e6031b' 
  AND token = 'BLpBNChB9kP80k2aRLqC3rh13EKHTwWSze6q1A12+9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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