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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaa9a5d4ddb056d28260e6b461a62fc6e0940632e2ce1525f82c3b5acad2d59' 
  AND token = 'o8p2oB+1BM1rkcXoSABoJ7pUGdqv3J2tWlM6gVRGUUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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