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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8a03a72e31ab9180b8e2928385de64b510cf4d6b6b6fbe46d9c6e5819419dd' 
  AND token = 'pdndzuswBJ8MBXEV+w+YdGeKV0lXcn1lPTa58NebvGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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