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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c999a65a65b459ea155b9dd62f71972365ceeec37b44f0a6ce0b9299b3abe1' 
  AND token = '/6bk8IgDSAJC/Z6WESKehE5gyefJn22ShJ32AbWzM4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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