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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d920543a1d931e53e4ffc24ca8f62de93ea6bdd7a96097672c867bf82126477' 
  AND token = 'hgZ77v1Bh2VtN2EPGyCUul3OOxgjH5kDegPvyxX5vM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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