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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da390b3301c77700ac489cf3a009cf068eb7fc17157b5e0b8ebee9ccace69d9' 
  AND token = '517ulLjG6O/OZJNc/raOjZSddW2N0nn6E12XSebKV1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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