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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202f45a8b2ca1bb74857e85b6189a86e37fbe851297860910b952fc51f50d0f0' 
  AND token = 'v9Pj6//cMuQDirq3DhMuJr+SMgiptmMYRn10kUW0hX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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