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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaef1b3c46a3d786ad3ba11f3c8a2d5600513c9b6b4fa5053c8a08bc125c157' 
  AND token = 'oq68T+4ZmJhXUvA1cVLRk7vq1z18n24+JDj9psPo5ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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