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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a232f9dc0868128a113a3a1fb55567716f26d45cabb4b90841fa321f77c1fb0' 
  AND token = 'dzPm8D3XyPbT080a2qq8kuBOIqMA6Mj3cgXabHpn5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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