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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7797ee4b7cc3c91fdc94db99d32d8be516db095ef1a6108b0071aa0f31138ca' 
  AND token = 'AhURQItJNf8H99IkdYR7uPGCrfkublMWMS7bHlGD7Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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