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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3014eadb504ccc373e0f8be923c013f2e42bd2d873bfe0b0bae8f1a0b8547ff' 
  AND token = 'uMff+i5w6hDvIkMleSfpyOYCfFD+vcIYwYQgT6jNeug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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