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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e31db549f0dd3113582d09eb349e73e60fde474b3f9e618d976dbbda157d91' 
  AND token = 'RvlffxXApnHrUFAeuaOcFE94dbLzOT0c/YWQGrLX4Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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