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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717c66aedacf27cc710702da5d53ec83dd962926ba2074089ecd8b4cb1f9308d' 
  AND token = 'Rf174oaM0LUOLhUG+2FSbmf33CjH3MPFpI02DS0Th6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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