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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf4c523196e2037c6d236df985b2d116004478d5e05de84bdaba4a945c1d72f' 
  AND token = 'WGhhGT+41t0ISrM9GQgNNJBbvn9mRdu1geXM7doUIFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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