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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffed4ac3247c08b5a9076d6a9521addc717cc94a05b5627325cfafe381cca7fd' 
  AND token = 'DvAjmwWROFS1nodRckmJGGh45FS/FcWhr0jee0+tfU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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