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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ada0befb76abb3798464a62d658a04edf64b8b7ab6bdcf24ea5baa023f57941' 
  AND token = 'wBsHOgZrWcznUhuq4WApxaX6nSbpjo/biprTF34Ncwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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