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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d06b683b9eb3998e0850f227c96bb26ff3b6f8dfe0d02150867d069dd0069c' 
  AND token = 'LsbKFehg8yzLk5fgpM37N6fvfBc49zLguWIOXHPBZro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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