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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de93ea3e225bde3cbfa09bd123928cd106d6ab06cc616c055599dafd107d24f' 
  AND token = '7Rac3FX/03Bb2cW/OrWEa1rdwV5sIpYbElkvvI6Xk2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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