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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec09ca4e6aa987d3b8af8be4e83b93069fb40e522455b7bbad12a0eba7ab3c91' 
  AND token = 'v7z3EZD20jJTF+40ubXZuSCI6YKqSwfiZQbfYLoA6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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