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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c2eb589e26a4a41495cd2ac8c27dcc6948f29524f6df40e251983f5b41b69a' 
  AND token = 'BAINtPs3EVQnlPXNp3AZqXfFibVQjFq6yV0u6fo62Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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