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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cec4565d616f10a3532f4c7dae47ae62058e0f73fe8924aa9bc5ea1cf93149b' 
  AND token = '4cvxCItLhFl5dN47um/JjAhi/168tokeoaisKq3zb5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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