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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8f07173abcd171510363a2343ce1ded7a62d3f53bdeaabf10c0b3acdf6ec57' 
  AND token = 'XaUcuLC3O/PipO4sTfLx76ODWRLn6IhcWCewRuHL6Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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