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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a3a5a9a0a7e1fc0fd416c2f12b5aa8c5c511c4340fa572b0ac52e931b3cc9e' 
  AND token = 'QNl4CwhZs2vuuYPvs8GmToQxl1Wr8/b9p9apLylfjuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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