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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a59caba4f37b335b7b46960916ca0dea69f7e4723c0ce4f645562fdc802eac2' 
  AND token = 'nFnN/PsXnX/R+Z081sZJzdehqfOY/NtIknVn4LlirNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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