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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93a8c3f4acfc3362afb87c5e94155734ddff116b62c979ede1d8b6327348e98' 
  AND token = 'DeZ5SnNqJPsUAiV/sC89is2KLsd2R3zI0QD15CD8RGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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