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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a108e13b1371bcbce5338a44ef28721ad6692ee2b5f15558b5c4a3e59b26e807' 
  AND token = 'QA4Xn9GyJHw68Wx2kjDUlZVD7UH7gfaXPdGyQflVREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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