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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c7e075fb9447339c6371f91b02f61644d4bab2b5f441808bdc0e11b37b03de' 
  AND token = 'Ahw3r/cWuts1xfwgBD24MF8kDqypJ7VxFxMAczAl1iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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