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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57eb23e584235bef829d05958276d7863fe01440623e79d05621e45de8f0c4b' 
  AND token = 'ojYgt79gHVoTzIsVYIMBs8JN9IZs3q787/1s7VxsRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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