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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8a00b20175b0f5b233b3e1ba8dfc35f2ef9e5de44983b4fef3b80b1a59faff' 
  AND token = 'SpsR6fvT+VP/vS6PnGRhgZ715InrTgpm4P+8r6v/yUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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