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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9804e75de66a33f391c29e2b2fce688ef17d68dce611f6c10dd59eee50531e49' 
  AND token = 'pUp+5pDSjEcBjtSHlIh3B7b8SbPQ2TN4jRr5KbDbp/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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