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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b93ea3ed1feba7a49caffa42cdfb02a7712dd4cdd6516680d84a6d6afadb1d6' 
  AND token = 'bAQ9Is4fVX7LPW9VYk8WTKUm1bue4SuJF5hIcESx1G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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