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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c9de4d5926ff91af00f16e8fb37aaf3bb031da0cc4bb8259ca65b233429e67' 
  AND token = 'AbmR2k8iE3XpSHDYFjsn8B50UCwLhO7iNrb73sAk++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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