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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e300a254d6bf92d81699c83c8db323e3beb2fec6e4be3dd8fda2b8d79ecefb' 
  AND token = '5zPCpmHYuTIcR+ORm7mEAuudLxyWjirdpd6hi8c4QiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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