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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575e5c1be662ceb2b7628be1207c8baf2d0a3cd81f17653496a448c2e0db4f2e' 
  AND token = 'W205AMMkCz6xFnmh1OrqBDjeHfftsPLAn3q07Cq+T9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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